PLATE 27. : 
1-44. Echinonéus cyclostomus Lrsker. 
Spines. 
1.— Spine, 1.50 mm. long, from left anterior interamhulacrum, near actinostome. 
2.— Spine, 1.50 mm. long, outline of serration of Figure 1. 
3.— Spine 1.65 mm. long, from odd posterior interambulacrum, near actinostome. 
4.— Spine, 2.6 mm. long, from right anterior interambulacrum, midway between actinostome and 
ambitus. 
5.— Spine, 1.22 mm. long, from right anterior interambulacrum, at ambitus. 
6.— Spine, 0.82 mm. long, from left anterior interambulacrum, actinal side. 
7.— Spine, 0.82 mm. long, detail of Figure 6, top view, larger magnification. 
8.— Spine, 0.65 mm. long, from near apical system. 
9.— Spine, 0.38 mm. long, from apical system. 
10.— Spine, 0.22 mm. long, from the madreporic plate. 
11.— Spine, 0.22 mm. long, same as Figure 10, larger magnification. 
12.— Stalk, 0.34 mm. long, of an ophicephalous pedicellaria, from left posterior interambulacrum. 
13.— Stalk, 0.34 mm. long, same as Figure 12, larger magnification. 
14.— Spine, 1.20 mm. long, from right anterior interambulacrum, towards actinostome. 
Figures 1-14. Fakarava Island, Paumotu Islands. 
Figures 1-8, 12-13, are from an alcoholic specimen with spines measuring 23 mm. long. Figures 9, 
10, 11, and 14 from an alcoholic specimen with spines measuring 11 mm. long. The enlargement is 
same as those on Plate 26 from Makemo Island. 
15.— Spine, 1.95 mm. long, from right posterior ambulacrum, near actinostome. 
16.— Spine, 2.80 mm. long, from odd posterior interambulacrum, near anal system. 
17.— Spine, 2.92 mm. long, from odd posterior interambulacrum, near anal system. 
18.— Spine, 1.64 mm. long, from right anterior interambulacrum, at ambitus. 
19.— Spine, 1.54 mm. long, from anal system. 
20.— Spine, 1 mm. long, from apex. 
* 21.— Spine, 0.42 mm. long, from madreporic plate. : 
22.— Spine, 0.42 mm. long, same as Figure 21, larger magnification. 
23.— Stalk, 0.52 mm. long, of a globiferous pedicellaria, from right anterior interambulacrum, abactinal 
side. 
24.— Stalk, 0.52 mm. long, same as Figure 23, larger magnification. 
Figures 15-24, Barbados, (?) are from an aleoholie specimen, with spines measuring 30 mm. long. 
Enlargement identical with those from Lord Howe Island. 
Spine, 1.63 mm. long, from right posterior interambulacrum, near actinostome. 
20-— 
26.— Spine, 2.26 mm. long, from odd posterior interambulacrum, near anal system. 
27.— Spine, 1.46 mm. long | 
eee gana lone | from right anterior interambulacrum, at ambitus. 
29.— Spine, 1.6 mm. long | 
30.— Spine, 0.86 mm. long § 
31.— Spine, 0.38 mm. long, from madreporie plate. 
32.— Spine, 0.38 mm. long, same as Figure 31, larger magnification. 
33.— Spine, 1 mm. long, from odd anterior ambulacrum, actinal side. 
34.— Spine, 1 mm. long, top of Figure 33, larger magnification. 
35.— Stalk, 1.4 mm. long, of an ophicephalous pedicellaria, from left anterior interambulacrum, actinal 
side. 
36.— Stalk, 1.4 mm. long, same as Figure 35, larger magnification. 
37.— Spine, 0.56 mm. long, from right anterior interambulacrum, at edge of actinostome. 
38.— Spine, 0.78 mm. long, from odd posterior interambulacrum, near anal system. 
from right anterior interambulacrum, near apical system. 
